Air purifier



FIG. 1 is a front elevation view of an air purifier showing my design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a perspective view thereof;

FIG. 8 is another perspective view thereof; and,

FIG. 9 is an enlarged view of the portion 9 in FIG. 8 .

The evenly spaced broken lines depict portions of the air purifier that form no part of the claimed design. The dot-dot-dash lines denote the boundaries of the detail areas and form no part of the claim. 

CLAIM The ornamental design for an air purifier, as shown and described. 